cylinder size

Does anyone manufacture a steel high pressure (3442psi) cylinder for sale in the US with similar dimensions to a steel LP 50? (I.e. ~5.5"x25") Such a tank, assuming similar wall thickness, would have an air capacity around 63.5 cuft. Perhaps there is such a product but it's usually only used...

Hi I wondered if anyone could give me some info or thoughts as to whether or not Sidemount may work better for my issues below and what kind of set ups people have used who are similar in size? I am 5ft 2” and short waisted (14inch back length) with wide hips . I have dived numerous wings/back...